Mark R. Fleisher
Expertise in
21
conditions

Dr. Mark R. Fleisher

Gastroenterology
Office
836 Prudential Dr Ste 801, 
Jacksonville, FL 
Accepting New Patients
Expertise in
21
conditions
Office
836 Prudential Dr Ste 801, 
Jacksonville, FL 

Overview

Mark R. Fleisher, MD, is an independent gastroenterologist at Ascension St. Vincent’s in Jacksonville, Florida. He diagnoses and treats gastrointestinal (GI) diseases and disorders in adults. Dr. Fleisher has clinical interest in caring for adults with celiac disease, Crohn's disease, ulcerative colitis, GI motility disorders, liver disease, cystic fibrosis, inflammatory bowel disease (IBD), eosinophilic esophagitis (EoE), gastroesophageal reflux disease (GERD), and pancreatitis.

Dr. Fleisher is highly rated in 21 conditions, according to our data. His clinical expertise encompasses Berdon Syndrome, Crohn's Disease, Gastrointestinal Bleeding, Endoscopy, and Gastrectomy.

Dr. Fleisher is board certified in The American Board Of Internal Medicine - Gastroenterology. He is actively involved in clinical research, co-authoring 5 peer reviewed articles and participating in 10 clinical trials. Dr. Fleisher is currently accepting new patients.

Graduate Institution

Educational Commission For Foreign Medical Grads

Residency

Lenox Hill Hospital

Specialties

Gastroenterology

Licenses

Internal Medicine in FL

Board Certifications

The American Board Of Internal Medicine - Gastroenterology

Fellowships

Lenox Hill Hospital

Hospital Affiliations

Ascension St. Vincent's Southside Hospital

Languages Spoken

English
Spanish

Gender

Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Anthem BCBS
  • EPO
  • HMO
  • POS
  • PPO
AvMed
  • HMO
  • POS
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
Coordinated Care
  • HMO
  • MANAGED MEDICAID PLAN
Devoted Health
  • MEDICARE MAPD
  • OTHER MEDICARE
Florida Blue
  • EPO
  • PPO
Health Care Services Corporation
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Health Options
  • HMO
  • POS
  • PPO
Highmark
  • EPO
  • HMO
  • PPO
Horizon Healthcare
  • EPO
  • POS
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Managed Medicaid
  • OTHER MANAGED MEDICAID
Medica
  • EPO
  • HMO
  • PPO
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
Meridian Choice
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
Premera Blue Cross
  • INSURANCE PLAN
  • MEDICARE MAPD
  • OTHER COMMERCIAL
  • PPO
Simply Healthcare
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • OTHER MEDICARE PART D
Sunshine Health
  • EPO
  • HMO
TeamCare
  • OTHER COMMERCIAL
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
Walgreens
  • MEDICARE DISCOUNT CARD
  • MEDICARE PDP
  • OTHER MEDICARE
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 20 Less Insurance Carriers -

Locations

Office
836 Prudential Dr Ste 801, Jacksonville, FL 32207

Additional Areas of Focus

Dr. Fleisher has provided the following conditions as areas of focus. Please note that we may not have enough data to validate their experience in some of these conditions.

Non-Alcoholic Fatty Liver Disease
Nonalcoholic Steatohepatitis (NASH)

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.

8 Clinical Trials

A Phase 3, Multicenter, Open-Label Extension Study to Evaluate the Long Term Efficacy and Safety of Mirikizumab in Patients With Moderately to Severely Active Ulcerative Colitis LUCENT 3
A Phase 3, Multicenter, Open-Label Extension Study to Evaluate the Long Term Efficacy and Safety of Mirikizumab in Patients With Moderately to Severely Active Ulcerative Colitis LUCENT 3
Enrollment Status: Active_not_recruiting
Publish Date: April 20, 2026
Intervention Type: Drug
Study Drug: Mirikizumab
Study Phase: Phase 3
PillCam SB3 Registry for Development and Validation of Improved Algorithms for GI Pathologies Detection
PillCam SB3 Registry for Development and Validation of Improved Algorithms for GI Pathologies Detection
Enrollment Status: Completed
Publish Date: October 27, 2025
A Phase 3, Multicenter, Randomized, Double-Blind, Parallel, Placebo-Controlled Induction Study of Mirikizumab in Conventional-Failed and Biologic-Failed Patients With Moderately to Severely Active Ulcerative Colitis (LUCENT 1)
A Phase 3, Multicenter, Randomized, Double-Blind, Parallel, Placebo-Controlled Induction Study of Mirikizumab in Conventional-Failed and Biologic-Failed Patients With Moderately to Severely Active Ulcerative Colitis (LUCENT 1)
Enrollment Status: Completed
Publish Date: May 31, 2025
Intervention Type: Drug
Study Drug: Mirikizumab
Study Phase: Phase 3
A Phase 3 Long-term Safety Extension Study of SHP647 in Subjects With Moderate to Severe Ulcerative Colitis or Crohn's Disease (AIDA)
A Phase 3 Long-term Safety Extension Study of SHP647 in Subjects With Moderate to Severe Ulcerative Colitis or Crohn's Disease (AIDA)
Enrollment Status: Completed
Publish Date: June 21, 2024
Intervention Type: Drug
Study Drug: Ontamalimab
Study Phase: Phase 3
A Phase 3 Randomized, Double-blind, Placebo-controlled, Parallel-group Efficacy and Safety Study of SHP647 as Maintenance Therapy in Subjects With Moderate to Severe Ulcerative Colitis (FIGARO UC 303)
A Phase 3 Randomized, Double-blind, Placebo-controlled, Parallel-group Efficacy and Safety Study of SHP647 as Maintenance Therapy in Subjects With Moderate to Severe Ulcerative Colitis (FIGARO UC 303)
Enrollment Status: Completed
Publish Date: January 14, 2022
Intervention Type: Other, Drug
Study Phase: Phase 3
A Phase 3 Randomized, Double-blind, Placebo-controlled, Parallel-group Efficacy and Safety Study of SHP647 as Induction Therapy in Subjects With Moderate to Severe Ulcerative Colitis (FIGARO UC 302)
A Phase 3 Randomized, Double-blind, Placebo-controlled, Parallel-group Efficacy and Safety Study of SHP647 as Induction Therapy in Subjects With Moderate to Severe Ulcerative Colitis (FIGARO UC 302)
Enrollment Status: Terminated
Publish Date: April 26, 2021
Intervention Type: Drug
Study Phase: Phase 3
A Phase 2, Multicenter, Randomized, Double-Blind, Parallel, Placebo-Controlled Study of LY3074828 in Subjects With Moderate to Severe Ulcerative Colitis
A Phase 2, Multicenter, Randomized, Double-Blind, Parallel, Placebo-Controlled Study of LY3074828 in Subjects With Moderate to Severe Ulcerative Colitis
Enrollment Status: Completed
Publish Date: June 17, 2020
Intervention Type: Drug
Study Phase: Phase 2
Multicenter, Prospective, Randomized Study Comparing the Diagnostic Yield of Colon Capsule Endoscopy Versus Computed Tomographic Colonography in a Screening Population
Multicenter, Prospective, Randomized Study Comparing the Diagnostic Yield of Colon Capsule Endoscopy Versus Computed Tomographic Colonography in a Screening Population
Enrollment Status: Completed
Publish Date: October 01, 2019
Intervention Type: Device
Study Phase: Not Applicable
View 7 Less Clinical Trials

5 Total Publications

Multicentre, prospective, randomised study comparing the diagnostic yield of colon capsule endoscopy versus CT colonography in a screening population (the TOPAZ study).
Multicentre, prospective, randomised study comparing the diagnostic yield of colon capsule endoscopy versus CT colonography in a screening population (the TOPAZ study).
Journal: Gut
Published: July 20, 2020
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Frequently Asked Questions about Dr. Mark R. Fleisher

How do I make an appointment with Dr. Mark R. Fleisher?

You can book an appointment with Dr. Mark R. Fleisher by calling their office at 904-288-0433. MediFind provides direct contact information so you can schedule visits, second opinions, or consultations without navigating third-party calendars.

Is Dr. Mark R. Fleisher a top-rated expert for Berdon Syndrome?

MediFind is an objective health platform that identifies experts based on real-world data. Dr. Mark R. Fleisher is classified as an Distinguished expert for Berdon Syndrome, meaning they are among the top experts in the country for this condition. This ranking is based on their volume of patients, published research, and peer connections.

What conditions does Dr. Mark R. Fleisher specialize in?

While Dr. Mark R. Fleisher is a Gastroenterology, they have specific expertise in Berdon Syndrome, Crohn's Disease, and Gastrointestinal Bleeding. MediFind analyzes a doctor's articles and referral patterns to identify their specific areas of focus within Gastroenterology.

Does Dr. Mark R. Fleisher participate in research or clinical trials?

Yes. Dr. Mark R. Fleisher has published 5 articles and abstracts on conditions like Berdon Syndrome. You can view a list of Dr. Mark R. Fleisher's latest peer-reviewed publications and clinical trial participation on their profile to see if they are active in new treatments.

Does Dr. Mark R. Fleisher accept my insurance?

Dr. Mark R. Fleisher accepts most major insurance plans, including Aetna and Anthem BCBS. We recommend calling the office directly at 904-288-0433 to verify that your specific plan is currently accepted before your visit.

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

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